Problems with multiple monitors in Ubuntu 13.04

[Carl Perry]

Greetings -

I have two 6450 cards in my Ubuntu 13.04 system with three monitors.
This is a recent install with no binary drivers installed and no
additional X ppa's installed. I can get X to display output on the
primary monitor, and I can see all three in xrandr:

Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 2560x1440+0+0 (normal left inverted right x axis y axis)
597mm x 336mm
   2560x1440      60.0*+
VGA-0 disconnected (normal left inverted right x axis y axis)
HDMI-1 connected 1920x1080+0+0 (normal left inverted right x axis y
axis) 475mm x 267mm
   1920x1080      60.0*+
   1280x1024      75.0     60.0 
   1152x864       75.0 
   1024x768       75.1     60.0 
   800x600        75.0     60.3 
   640x480        75.0     60.0 
   720x400        70.1 
DVI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis)
475mm x 267mm
   1920x1080      60.0*+
   1280x1024      75.0     60.0 
   1152x864       75.0 
   1024x768       75.1     60.0 
   800x600        75.0     60.3 
   640x480        75.0     60.0 
   720x400        70.1 
VGA-1 disconnected (normal left inverted right x axis y axis)


The second and third monitor are on (out of power save mode) but show no
input. However, XFCE seems to detect them as I have two wallpapers
stacked on top of each other, one at the main monitor's 2560x1440
resolution and one at a 1920x1080 resolution (see
http://edolnx-public.objects.dreamhost.com/Screenshot%20-%2005072013%20-%2009_10_02%20AM.png
). Attempting to make any changes with xrandr causes X to crash with a
SIGSEGV. Here's a log: http://paste.ubuntu.com/5640585/ Any ideas?

  -Carl
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